It is worthy of note that a significant increase in cysteinylated hemoglobin (CySSHb) in HD patients was also observed (38.3 vs 11.5 pmol/mg Hb; p < 0.001) and that RBCs from HD patients contained twice as much CySSHb than HbSSG (Khazim et al. 2013). Here, GSTM1 is linked to Huntington disease.